Presentation Transcript

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EC200163377 SMART ANTENNA
under the guidance of
Mr. G.V.Kiran Kumar

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EC200163377 What is Smart Antenna? A smart antenna system combines multiple antenna elements with a signal-processing capability to optimize its radiation and/or reception pattern automatically in response to the signal environment.
In truth, antennas are not smart—antenna systems are smart. Generally co-located with a base station, a smart antenna system combines an antenna array with a digital signal-processing capability to transmit and receive in an adaptive, spatially sensitive manner.

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EC200163377 Switched Beam Antennas It form multiple fixed beams with heightened sensitivity in particular directions.
These antenna systems detect signal strength, choose from one of several predetermined, fixed beams, and switch from one beam to another as the mobile moves throughout the sector.
switched beam systems combine the outputs of multiple antennas in such a way as to form finely sectorized (directional) beams with more selectivity .

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EC200163377 The goals of a smart antenna system The purpose of a smart antenna system is to augment the signal quality of the radio-based system through more focused transmission of radio signals while enhancing capacity through increased frequency reuse.
The features of a smart antenna system are
- signal gain.
- inference rejection.
-power efficiency.

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EC200163377 Architecture of smart antenna system Switched beam and adaptive array systems enable a base station to customize the beams they generate for each remote user effectively by means of internal feedback control.
Listening to the cell.(uplink processing).
Speaking to the users(downlink processing).

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EC200163377 Who can use smart antennas ? Smart antenna technology can significantly improve wireless system performance and economics for a range of potential users.
It enables operators of PCS, cellular, and wireless local loop (WLL) networks to realize significant increases in signal quality, capacity, and coverage.

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EC200163377 Smart antennas can help systems meet these requirements in the following manner:
First, both phased and adaptive arrays provide increased power by providing higher gain for the desired signal.
In terms of interference suppression, phased arrays reduce the probability of interference with the narrower beam, and adaptive arrays adjust the beam pattern to suppress interference. Advantages of smart antenna

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EC200163377 Phased arrays are mainly being studied for point-to-point wireless systems, e.g., for wireless local loops.
Adaptive arrays are being considered on cellular terminals where local scattering causes wide angular spread.
In the TDMA system ANSI-136 adaptive antenna algorithms have been widely deployed. Uses of smart antenna

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EC200163377 Conclusion The use of smart antennas is not purely a radio transmission issue.
It also influences network services such as handover and connection setup.
A smart antenna is a digital wireless communications antenna system that takes advantage of diversity effect at the source (transmitter), the destination (receiver), or both.